1. Graphite blocks: goog quality , long life , low noise 2. Apply to heaters,heat shields,crucibles , boats.etc MATERIAL: Extruded Graphite,Molded Graphite,Isostatic Graphite,Vibration Graphite,High density and high Flexural Strength graphite material . (Die molded graphite),High pure extruded graphite,Special carburizing treatment graphite materialCHARACTERISTIC :1.perfect sealing performance , ...